For the most part, they are pronounced differently and shouldn't sound the same. Anyways, 'than' is used when you are making a comparison. 'Then' is used in different ways. "It was an easier time, then (at that time)", "Go straight, then (next) turn left at the light", "If you are him, then (in that case) come forward". There are some more ways to use then here.
Firebreaker t1_je8skl3 wrote
Reply to ELI5: Then or than by National_Edges
For the most part, they are pronounced differently and shouldn't sound the same. Anyways, 'than' is used when you are making a comparison. 'Then' is used in different ways. "It was an easier time, then (at that time)", "Go straight, then (next) turn left at the light", "If you are him, then (in that case) come forward". There are some more ways to use then here.